Abstract
Effects of single-mode microwave irradiation on metal hydrides, MH n (LiH, MgH 2, CaH 2, TiH 2, VH 0.81, ZrH 2, and LaH 2.48) and complex hydrides MBH 4 (LiBH 4, NaBH 4, and KBH 4) were systematically investigated. Among the metal hydrides, TiH 2, VH 0.81, ZrH 2, and LaH 2.48 exhibit a rapid heating by microwave irradiation, where small amount of hydrogen (less than 0.5 mass%) are desorbed. On the other hand, LiBH 4 is heated above 380 K by microwave irradiation, where 13.7 mass% of hydrogen is desorbed. The rapid heating of metal hydrides such as TiH 2, VH 0.81, ZrH 2, and LaH 2.48 are mainly due to the conductive loss. Meanwhile the microwave heating in LiBH 4 is attributed to the conductive loss which is caused by a structural transition. The difference in the amount of desorbed hydrogen between metal hydrides and complex hydrides might be caused by the different microwave penetration depth and/or the temperature saturation in the microwave irradiation process. Microwave heating might be applied to hydrogen storage system, though further development of hydrides themselves and engineering techniques are required.
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